As they get older, more of their friends get hitched and start families. Kang, 40, who has never had a relationship, puts it this way: "As a single, you tend to hang out with singles.
The friends have less time to hang out and have fewer new friends to recommend as possible matches. We tend to get 'more single'." There have always been more women than men in her life.
In 2004, there were 844,100 Singapore residents who were singles, compared to 1,048,100 last year - a jump of almost 25 per cent over 10 years, figures from the Department of Statistics show.
The number of singles also rose across all ages surveyed, but the sharpest spike was in the 50s age group.
Two years ago, she attended events organised by dating agencies, but found it "draining and depressing" when she did not find a suitable match.
One criterion for her partner is that his salary should be similar to hers, that is, at least ,000 a month, an amount she says is "realistic" for someone in his mid- to late-40s.
"We spent the previous decade telling ourselves that we're happy as we are, and if it happens, it happens," she says.
Three years ago, hoping to get over an unrequited crush, she took matters into her own hands and joined the Ok Cupid dating website. Three years later, she has gone on dates with men in their 30s, 40s and 50s, but has remained single. Ms Yeo is part of Singapore's swelling ranks of "singles" - a term used by statistics gatherers to define someone who has never married - who are aged 35 and older.She was from a girls' school and mostly socialised with the same group of friends through secondary school, junior college and university.In her business administration course at the National University of Singapore and at her places of work, women also outnumbered men.She adds: "When you're older, you're also more likely to know what you want and less likely to compromise." The median age for first-time grooms in Singapore rose from 29.1 years in 2003 to 30.2 years in 2013. If so many people want to put a ring on it, why is it not happening?Older singles Life interviewed say the challenges they faced include ambivalent attitudes towards dating, dwindling social circles, a mismatch in expectations and a self-sufficient lifestyle.I'd think, maybe another girl would be better," he says, which would spur him to get on the dating treadmill again.